Techron Marine Fuel System Treatment is specifically engineered to be an excellent solution for protection in the recreational boating industry. Techron Marine combines corrosion protection with fuel stability, detergency for cleaning power; all without contributing to water uptake. Recommended for use in: All Gasoline engines including two-stroke, four-stroke, carbureted, port- or electronic-fuel-injected and direct-injected engines. Not for Aviation. Engines burning E0 or ethanol-blended fuel such as E10, E15 and E85. Will not harm catalytic converters and oxygen sensors.